the shape of or structure is not familiar for me

There is this command I do not know if it is equal to a normal or command :

if or(routine==3,routine==4)

and also , is routine an external parameter ? cause I did not see that introduce before hand , in the code i am reading , I was wondering that it might be an in built variable ?

Answer 1

[Image Analyst]

Why make it complicated? Just simply do

if routine==3 || routine==4